Bushfires Flashcards

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1
Q

The fire triangle has three elements

A

Oxygen, heat, fuel

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2
Q

The greater the fuel load the _____ the fire is

A

Hotter

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3
Q

What accounts for over half of bushfires?

A

Lightning

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4
Q

Do Flames at the fire front ignite anything flammable?

A

Yes

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5
Q

What is the most dangerous type of fire front?

A

Running crown fire

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6
Q

How do spot fires start?

A

When hot embers or debris are picked up by the wind

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7
Q

How far can embers fly in the wind?

A

Up to 30 Kms

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8
Q

How fast do grass fires pass?

A

5-10 seconds

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9
Q

How long do grass fires smoulder for?

A

Only Minutes after fire has passed

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10
Q

How intense are grass fires?

A

Low to Moderate

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11
Q

Do bushfires move faster than grass fires?

A

No

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12
Q

What are hotter bushfires or grassfires?

A

Bushfires

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13
Q

How do Australian eucalypts survive in times of drought?

A

By reducing water loss by shedding their leaves

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14
Q

Why do eucalypts contain aromatic oils and waxes?

A

To discourage insects from eating them

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15
Q

The low water content along with the oils characteristic of eucalypts in drought means?

A

They burn explosively in bushfires

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16
Q

When a fire passes through three crowns, they appear to explode when?

A

The oil rich vapour ignites in a fire ball

17
Q

Bushfire conditions are dangerous when humidity is below?

A

25%

18
Q

Fires seem to spread more quickly up?

A

Hillsides and slopes

19
Q

Why do fires spread up Hillsides and slopes faster than flat land?

A

The fires preheat their fuel source with the risen hot air

20
Q

Temperature rises by double every?

A

10 degrees of slope

21
Q

Every 10 degrees of slope temperature _____?

A

Doubles

22
Q

In what time period do eucalypt trees grow another layer of bark?

A

Every year

23
Q

What defines a low pressure cell?

A

A group of isobars where the pressure decreases toward the middle

24
Q

What is the type of pressure when a group of isobars where the pressure decreases toward the middle?

A

Low pressure system

25
Q

What does low pressure indicate?

A

Bad weather along with wind moving clockwise

26
Q

What is the type of pressure when a group of isobars where the pressure increases toward the centre?

A

High pressure cell

27
Q

What do high pressure cells indicate?

A

Good weather

28
Q

What is an isobar?

A

Lines indicating weather pressure

29
Q

How does a cold front occur?

A

When cold air invades warm air

30
Q

What indicates a cold front?

A

Sharp symbols on the isobars

31
Q

How does a warm front occur?

A

Advancing warm air rises over colder retreating air

32
Q

What indicates a warm front?

A

Semicircles along the isobars

33
Q

What are the results of a warm front?

A

Humidity and rain

34
Q

What is an occluded front?

A

When a cold front overtakes a warm air

35
Q

What forms as a result of an occluded front?

A

Dense clouds

36
Q

What way do winds blow ahead of a cold front?

A

From the north west

37
Q

What is it called when there is a lack of moisture in the air?

A

A moisture deficit

38
Q

What is a moisture deficit?

A

When there is a lack of moisture in the air